Sewing machine attachment



y 1937. c. T. T'HMPSON SEWING MACHINE ATTACHMENT Filed May 9, 1936 2Sheets-Sheet 1 ATTORNEY.

July 13, 1937. c. T. THOMPSON 2,086,830

SEWING MACHINE ATTACHMENT Filed May 9, 1936 2 Sheets-Sheet 2 V 65 4/7255mzzyasa/g IINVENTOR.

} ATTORNEY.

Patented July 13, 1937 UNITED STATS 1 Claim.

This invention relates to a sewing machine attachment and moreparticularly to a battery for operating the sewing machine.

This invention further relates to the battery and electric motor whichmay be attached to any make of sewing machine.

This invention further provides a sewing machine operating attachmentwhich is simple in construction and easy of operation.

Other objects and advantages will be under stood from the followingdescription of the speciflc embodiment when read in connection with theaccompanying drawings in which:

Figure 1 is a front elevation of a part of a sew- 5 ing machine showingthe improved attachment secured thereto.

Figure 2 is a view in side elevation of a sewing machine disclosing theattachment secured thereto.

Figure 3 is a sectional view of the upper portion of a battery and itscontainer.

Figure 4 is a plan view of the battery in its container. 7

Figure 5 is a sectional view of the top of the sewing machine disclosingthe switch means for operating the motor.

Figure 6 is a modification of the attachment shown in Figure 1, and is afront elevational view of a sewing machine with the novel attachingmeans secured thereto.

Figure 7 is a sectional view taken on line 'l-I of Figure 6 disclosingthe motor and switch means.

Figure 8 is side view of a guard for the belt carrying wheel of themotor.

Figure 9 is a perspective view of an idler pulley for the belt.

A sewing machine 20 has the usual bracket arm 22; and the main shaft 24has a fly-wheel 26 mounted thereon. A battery 28 is adapted to be placedin a box 30 which box is secured to the lower portion of the frame ofthe sewing machine 20. The box 30 has a hinged door 32 through which thebattery 28 is inserted. There are terminal contacts 34 and 36 secured tothe top portion of the battery box 30. The numeral 38 indicates thebattery terminal posts.

An electric motor 40 is secured to the end of a lever arm 58 which armis pivoted by bolt means 46 to a bracket 44 which is secured to the top2| of the sewing machine 20. The shaft 48 of the motor 48 carries awheel 50 on its inner end. There is a rod 52 extending upwardly from thetreadle 54, and a cord, rope or other suitable connecting means 56 whichconnects the rod 52 with the lever arm 58. The rope 56 is trained arounda pulley (ill fastened beneath the top portion 2! of the sewing machineZll. A coil spring 62 is connected at one end to the treadle M, and atits other end to the frame of the sewing machine 26.

The battery 28 has conductors 64 and 36 connected to the terminal posts38. The conductor 65 leads to a contact plate 63 beneath the top 2!ofthe sewing machine 2&3. There is a second contact plate 'lii securedbeneath the top 2! of the sewing machine 29 and is spaced apart from thecontact plate 5.38. The conductor 65 leads from the battery 28 to theelectric motor it and a conductor 72 leads from the contact plate ii! tothe motor 40. The conductors 5% and 72 extend through an aperture is inthe top portion of the sewing machine 26. The cable 56 carrying a metalring 16 extends through an aperture 78 in the top portion 25 of thesewing machine.

When it is desired to operate the sewing machine, the treadle 54 isdepressed and the rod 52 and rope 56 pull the lever arm 58 down and thelever arm 58 raises the motor 46 so that the wheel 5E3 frictionallyengages the fly-wheel 26 of the sewing machine. At the same time thering T6 on the rope 55 is carried downward and contacts the plates 58and ill thereby closing the circuit between the battery 28 and theelectric motor 4t, and the sewing machine is now operating.

In the modification shown in Figures 6 to 9 inclusive, the motor 80 isadapted to be mounted on the lower portion of the sewing machine frame52. The motor 80 is secured to the frame 82 by bolt means so that it canbe raised and lowered.

as desired. A coil spring 8| is connected between the motor 80 and theframe 82 of the sewing machine 20. The treadle 54 is connected by a rod8 3 to an arm 86 of the motor Bill. The electric motor 80 has anotherarm 88 which has a contact arm 90 mounted on its outer end. The contactarm 90 is adapted to engage a contact plate 95. A conductor 92 leadsfrom the terminal posts 38 of the battery 28 to the contact arm 90. Theother battery conductor 9 is connected to the motor 8!]. A conductor 96leads from the contact plate 9! to the electric motor 80.

A wheel 98 is connected on one end of the shaft 8-39 of the motor 80. Abelt 102 is trained over the wheel 98 and through apertures IM and Iiliito the grooved pulley 21 on the shaft 24 of the sewing machine 20. Thebelt I02 is trained over an idler pulley I08 of V-shap-ed constructionspaced in the aperture I64. The wheel 98 has a guard I I0 which isadapted to prevent the belt 82 from jumping off.

The operation of the modified device is as follows: The treadle 54 ispressed down and the rod 84 pulls down the motor 80 and as the motor 86is pulled down, the arm 88 of the motor brings the contact arm 98 intocontact with the plate 9!, and the circuit is closed between the battery28 and the motor 80. As soon as the circuit is closed between thebattery 28 and the motor 88, the sewing machine begins to operate. Whenthe treadle is allowed to rise, the coil spring raises the motor 88 andthe contact arm 98 disengages the contact plate 9|, and the circuitbetween the battery 28 and the motor 88 is broken.

The apparatus shown in the drawings and de-' cribed in the specificationare merely illustrative and the invention is not limited thereto sincealterations and modifications will readily suggest themselves to personsskilled in the art without departing from the true spirit of thisinvention or the scope of the annexed claim.

What I claim as new is:

Incombination with a sewing machine having a fiy-wheel and a treadle, abattery, an electric motorhaving a grooved wheel mounted on its shaftfor engaging the said fiy-wheel, and the said electric motor beingmounted on the end of a lever arm, the battery adapted to be in circuitwith the electric motor, means connecting the treadle to the lever armof the electric motor whereby the grooved wheel of the electric motormay be brought into engagement with the said fly-wheel, and a ring meanssecured to the said connecting means for closing the said circuitbetween the battery and electric motor.

COLUMBUS T. THOMPSON.

